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The MPR pressure regulator allows low pressure poultry drinkers like the 4009DD lubing red cup chicken drinker pair to be connected to town water ( under 500Kpa please)or water pressure greater than 30cm above cup drinkers.
the 4009 trigger cups are suitable for adult poultry but Silky and polish breeds struggle to access and target the trigger becuase of their fluffy heads.
To increase youe understanding of water pressure and chook drinkers please read Poultry Drinkers and Water pressure